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Showing content from https://docs.ruby-lang.org/en/3.4/SystemExit.html below:

class SystemExit - Documentation for Ruby 3.4

Raised by exit to initiate the termination of the script.

static VALUE
exit_initialize(int argc, VALUE *argv, VALUE exc)
{
    VALUE status;
    if (argc > 0) {
        status = *argv;

        switch (status) {
          case Qtrue:
            status = INT2FIX(EXIT_SUCCESS);
            ++argv;
            --argc;
            break;
          case Qfalse:
            status = INT2FIX(EXIT_FAILURE);
            ++argv;
            --argc;
            break;
          default:
            status = rb_check_to_int(status);
            if (NIL_P(status)) {
                status = INT2FIX(EXIT_SUCCESS);
            }
            else {
#if EXIT_SUCCESS != 0
                if (status == INT2FIX(0))
                    status = INT2FIX(EXIT_SUCCESS);
#endif
                ++argv;
                --argc;
            }
            break;
        }
    }
    else {
        status = INT2FIX(EXIT_SUCCESS);
    }
    rb_call_super(argc, argv);
    rb_ivar_set(exc, id_status, status);
    return exc;
}

Create a new SystemExit exception with the given status and message. Status is true, false, or an integer. If status is not given, true is used.

static VALUE
exit_status(VALUE exc)
{
    return rb_attr_get(exc, id_status);
}

Return the status value associated with this system exit.

static VALUE
exit_success_p(VALUE exc)
{
    VALUE status_val = rb_attr_get(exc, id_status);
    int status;

    if (NIL_P(status_val))
        return Qtrue;
    status = NUM2INT(status_val);
    return RBOOL(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
}

Returns true if exiting successful, false if not.

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